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Salmonellae are Gram negative, short plump shaped rods, non-lactose fermenting and non-sporulating bacteria, belonging to the family Enterobacteriacea, that has more than 2501 serotypes characterized on the basis of their somatic (0) and flagella (H) antigens (Beers et al.,2004; Todar, 2005). With the exception of Salmonella pullorum and Salmonella gallinarum, all Salmonellae are actively motile. They are also non-capsulated with the exception of Salmonella typhi (Cheesbrough, 2002, Perilla, 2003). The genus was named after Daniel Elmer Salmon, an American veterinary pathologist (FDA/CFSAN,
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